Improvement of Expansive Soils by Using Phosphogypsum

Çokça E., Özkan İ.

13th International Congress on Advances in Civil Engineering, İzmir, Turkey, 12 - 14 September 2018, vol.1, pp.152-157

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: İzmir
  • Country: Turkey
  • Page Numbers: pp.152-157


Expansive soils are an extensive trouble which triggers many challenges for civil engineers. Such soils have either swelling potential or shrinking potential under changing moisture conditions. Admixture stabilization is the most economical and efficient method for prevention of volume changes of these soils. In literature, studies related to remediation of expansive soil are very restricted. In this study the effect of phosphogypsum (PG) in reducing the swelling potential is examined. The expansive soil was prepared in the laboratory by mixing kaolinite and bentonite. Recycled PG was added to the soil at 5 to 25 percent by weight. Grain size distribution, Atterberg limits and swell percent were determined for each samples in this study. The swelling potential of expansive soil reduced by using phosphogypsum. Swelling potential of samples treated by phosphogypsum were gradually decreased with respect to the amount of phosphogypsum in samples. It is conclueded that the phosphogypsum is a suitable waste material for stabilization of expansive soils.